I am good friends with two colleagues - one male, one female. Both married and both older than me (I am in my 30's, they are in their 50's). We would often go out together and have drinks after work - all innocent (I thought).
One of them has just sent a text meant for the other to me by mistake. It is obviously that they are having an affair.
I am completely shocked, saddened and disgusted. I also feel a bit used and betrayed. Was I just a decoy to make spending time together acceptable?
Also, I am not sure whether to approach them about this. It is quite difficult to back off, as we work very closely together. Help!